Method for bleaching fibrous materials
First Claim
1. Method for bleaching fibre materials, in particular lignin-containing fibre materials for the production of paper, including the steps of adding at least one first additive into a suspension of fibre material;
- adding at least one bleaching lye into the suspension of fibre material, the bleaching lye having at least one bleaching agent;
mixing the bleaching lye with the suspension of fibre material;
completing the bleaching process with the addition of at least one second additive, characterized in that lime is used at least for adjusting the pH value of the suspension of fibre material before the bleaching.
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Accused Products
Abstract
The invention relates to a method for bleaching fibrous materials, in particular lignin-containing materials for producing paper consisting in adding at least a first additive and at least one type of bleaching liquid to a fibrous solution which contains at list one bleaching agent. After mixing said bleaching solution with the fibrous suspension and at the end of determined bleaching time, the bleaching process is ended by adding at least a second additive. Said invention is characterised in that the pH of the fibrous suspension is obtained by adding lime.
12 Citations
24 Claims
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1. Method for bleaching fibre materials, in particular lignin-containing fibre materials for the production of paper, including the steps of
adding at least one first additive into a suspension of fibre material; -
adding at least one bleaching lye into the suspension of fibre material, the bleaching lye having at least one bleaching agent;
mixing the bleaching lye with the suspension of fibre material;
completing the bleaching process with the addition of at least one second additive, characterized in that lime is used at least for adjusting the pH value of the suspension of fibre material before the bleaching. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A device for bleaching fibre materials with at least one mixer and one reaction space in which an aqueous suspension of fibre material is subjected to at least one bleaching, in particular one bleaching stage,
characterized in that a dosing device, which regulates and/or controls the addition of lime, in particular a lime at least partially dispersed in water, into the aqueous suspension of fibre material in the bleaching process as a function of predefined process parameters is provided.
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24. A device for bleaching fibre materials with at least a first container for storing lime having a predefined particle size distribution and purity, an extracting device and a transport and mixing device in which the lime is dissolved and/or dispersed and transported to at least a second container, and in which the at least partially dispersed lime is mixed with a suspension of fibre material according to predefined process parameters.
Specification